SOLUTION: A radiator contains 9 quarts of fluid, 40% of which is antifreeze. How much fluid should be drained and replaced with pure antifreeze so that the new mixture is 55% antifreeze?

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In words:
( final quarts of antifreeze) / ( final quarts of fluid ) = 55%
Let = quarts of fluid to be drained
and replaced with pure antifreeze
given:
= quarts of antifreeze in original mixture
= quarts of antifreeze that is drained off
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2.25 quarts of fluid should be drained
and replaced with pure antifreeze
check:




OK